src/rowpainter.cpp

   1 /**
   2  * \file rowpainter.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13 #include <algorithm>
  14
  15 #include "rowpainter.h"
  16
  17 #include "Bidi.h"
  18 #include "Buffer.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "BufferParams.h"
  22 #include "BufferView.h"
  23 #include "Changes.h"
  24 #include "Encoding.h"
  25 #include "Language.h"
  26 #include "Layout.h"
  27 #include "LyXRC.h"
  28 #include "Row.h"
  29 #include "MetricsInfo.h"
  30 #include "Paragraph.h"
  31 #include "ParagraphMetrics.h"
  32 #include "ParagraphParameters.h"
  33 #include "TextMetrics.h"
  34 #include "VSpace.h"
  35
  36 #include "frontends/FontMetrics.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/InsetText.h"
  40
  41 #include "mathed/InsetMath.h"
  42
  43 #include "support/debug.h"
  44 #include "support/gettext.h"
  45 #include "support/textutils.h"
  46
  47 #include "support/lassert.h"
  48 #include <boost/crc.hpp>
  49
  50 using namespace std;
  51
  52 namespace lyx {
  53
  54 using frontend::Painter;
  55 using frontend::FontMetrics;
  56
  57 RowPainter::RowPainter(PainterInfo & pi,
  58         Text const & text, pit_type pit, Row const & row, Bidi & bidi, int x, int y)
  59         : pi_(pi), text_(text),
  60           text_metrics_(pi_.base.bv->textMetrics(&text)),
  61           pars_(text.paragraphs()),
  62           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
  63           pm_(text_metrics_.parMetrics(pit)),
  64           bidi_(bidi), change_(pi_.change_),
  65           xo_(x), yo_(y), width_(text_metrics_.width()),
  66           solid_line_thickness_(1.0), solid_line_offset_(1),
  67           dotted_line_thickness_(1.0), dotted_line_offset_(2)
  68 {
  69         bidi_.computeTables(par_, pi_.base.bv->buffer(), row_);
  70
  71         if (lyxrc.zoom >= 200) {
  72                 // derive the line thickness from zoom factor
  73                 // the zoom is given in percent
  74                 // (increase thickness at 250%, 450% etc.)
  75                 solid_line_thickness_ = (float)(int((lyxrc.zoom + 50) / 200.0));
  76                 // adjust line_offset_ too
  77                 solid_line_offset_ = 1 + int(0.5 * solid_line_thickness_);
  78         }
  79         if (lyxrc.zoom >= 100) {
  80                 // derive the line thickness from zoom factor
  81                 // the zoom is given in percent
  82                 // (increase thickness at 150%, 250% etc.)
  83                 dotted_line_thickness_ = (float)(int((lyxrc.zoom + 50) / 100.0));
  84                 // adjust line_offset_ too
  85                 dotted_line_offset_ = int(0.5 * dotted_line_thickness_) + 1;
  86         }
  87
  88         x_ = row_.x + xo_;
  89
  90         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
  91         //row_.dump();
  92
  93         LASSERT(pit >= 0, /**/);
  94         LASSERT(pit < int(text.paragraphs().size()), /**/);
  95 }
  96
  97
  98 FontInfo RowPainter::labelFont() const
  99 {
 100         FontInfo f = text_.labelFont(par_);
 101         // selected text?
 102         if (row_.begin_margin_sel || pi_.selected)
 103                 f.setPaintColor(Color_selectiontext);
 104         return f;
 105 }
 106
 107
 108 int RowPainter::leftMargin() const
 109 {
 110         return text_metrics_.leftMargin(text_metrics_.width(), pit_,
 111                 row_.pos());
 112 }
 113
 114 // If you want to debug inset metrics uncomment the following line:
 115 //#define DEBUG_METRICS
 116 // This draws green lines around each inset.
 117
 118
 119 void RowPainter::paintInset(Inset const * inset, pos_type const pos)
 120 {
 121         Font const font = text_metrics_.displayFont(pit_, pos);
 122
 123         LASSERT(inset, return);
 124         // Backup full_repaint status because some insets (InsetTabular)
 125         // requires a full repaint
 126         bool pi_full_repaint = pi_.full_repaint;
 127
 128         pi_.base.font = inset->inheritFont() ? font.fontInfo() :
 129                 pi_.base.bv->buffer().params().getFont().fontInfo();
 130         pi_.ltr_pos = (bidi_.level(pos) % 2 == 0);
 131         pi_.change_ = change_.changed() ? change_ : par_.lookupChange(pos);
 132
 133         int const x1 = int(x_);
 134         pi_.base.bv->coordCache().insets().add(inset, x1, yo_);
 135         // insets are painted completely. Recursive
 136         // FIXME: it is wrong to completely paint the background
 137         // if we want to do single row painting.
 138         inset->drawBackground(pi_, x1, yo_);
 139         inset->drawSelection(pi_, x1, yo_);
 140         inset->draw(pi_, x1, yo_);
 141
 142         Dimension const & dim = pm_.insetDimension(inset);
 143
 144         paintForeignMark(x_, font.language(), dim.descent());
 145
 146         x_ += dim.width();
 147
 148         // Restore full_repaint status.
 149         pi_.full_repaint = pi_full_repaint;
 150
 151 #ifdef DEBUG_METRICS
 152         int const x2 = x1 + dim.wid;
 153         int const y1 = yo_ + dim.des;
 154         int const y2 = yo_ - dim.asc;
 155         pi_.pain.line(x1, y1, x1, y2, Color_green);
 156         pi_.pain.line(x1, y1, x2, y1, Color_green);
 157         pi_.pain.line(x2, y1, x2, y2, Color_green);
 158         pi_.pain.line(x1, y2, x2, y2, Color_green);
 159 #endif
 160 }
 161
 162
 163 void RowPainter::paintHebrewComposeChar(pos_type & vpos, FontInfo const & font)
 164 {
 165         pos_type pos = bidi_.vis2log(vpos);
 166
 167         docstring str;
 168
 169         // first char
 170         char_type c = par_.getChar(pos);
 171         str += c;
 172         ++vpos;
 173
 174         int const width = theFontMetrics(font).width(c);
 175         int dx = 0;
 176
 177         for (pos_type i = pos - 1; i >= 0; --i) {
 178                 c = par_.getChar(i);
 179                 if (!Encodings::isHebrewComposeChar(c)) {
 180                         if (isPrintableNonspace(c)) {
 181                                 int const width2 = pm_.singleWidth(i,
 182                                         text_metrics_.displayFont(pit_, i));
 183                                 dx = (c == 0x05e8 || // resh
 184                                       c == 0x05d3)   // dalet
 185                                         ? width2 - width
 186                                         : (width2 - width) / 2;
 187                         }
 188                         break;
 189                 }
 190         }
 191
 192         // Draw nikud
 193         pi_.pain.text(int(x_) + dx, yo_, str, font);
 194 }
 195
 196
 197 void RowPainter::paintArabicComposeChar(pos_type & vpos, FontInfo const & font)
 198 {
 199         pos_type pos = bidi_.vis2log(vpos);
 200         docstring str;
 201
 202         // first char
 203         char_type c = par_.getChar(pos);
 204         c = par_.transformChar(c, pos);
 205         str += c;
 206         ++vpos;
 207
 208         int const width = theFontMetrics(font).width(c);
 209         int dx = 0;
 210
 211         for (pos_type i = pos - 1; i >= 0; --i) {
 212                 c = par_.getChar(i);
 213                 if (!Encodings::isArabicComposeChar(c)) {
 214                         if (isPrintableNonspace(c)) {
 215                                 int const width2 = pm_.singleWidth(i,
 216                                                 text_metrics_.displayFont(pit_, i));
 217                                 dx = (width2 - width) / 2;
 218                         }
 219                         break;
 220                 }
 221         }
 222         // Draw nikud
 223         pi_.pain.text(int(x_) + dx, yo_, str, font);
 224 }
 225
 226
 227 void RowPainter::paintChars(pos_type & vpos, FontInfo const & font,
 228                             bool hebrew, bool arabic)
 229 {
 230         // This method takes up 70% of time when typing
 231         pos_type pos = bidi_.vis2log(vpos);
 232         // first character
 233         char_type prev_char = par_.getChar(pos);
 234         vector<char_type> str;
 235         str.reserve(100);
 236         str.push_back(prev_char);
 237
 238         if (arabic) {
 239                 char_type c = str[0];
 240                 if (c == '(')
 241                         c = ')';
 242                 else if (c == ')')
 243                         c = '(';
 244                 str[0] = par_.transformChar(c, pos);
 245         }
 246
 247         pos_type const end = row_.endpos();
 248         FontSpan const font_span = par_.fontSpan(pos);
 249         // Track-change status.
 250         Change const & change_running = par_.lookupChange(pos);
 251
 252         // selected text?
 253         bool const selection = (pos >= row_.sel_beg && pos < row_.sel_end)
 254                 || pi_.selected;
 255
 256         // spelling correct?
 257         bool const spell_state =
 258                 lyxrc.spellcheck_continuously && par_.isMisspelled(pos);
 259
 260         // collect as much similar chars as we can
 261         for (++vpos ; vpos < end ; ++vpos) {
 262                 // Work-around bug #6920
 263                 // The bug can be reproduced with DejaVu font under Linux.
 264                 // The issue is that we compute the metrics character by character
 265                 // in ParagraphMetrics::singleWidth(); but we paint word by word
 266                 // for performance reason.
 267                 // Maybe a more general fix would be draw character by character
 268                 // for some predefined fonts on some platform. In arabic and
 269                 // Hebrew we already do paint this way.
 270                 if (prev_char == 'f' || lyxrc.force_paint_single_char)
 271                         break;
 272
 273                 pos = bidi_.vis2log(vpos);
 274                 if (pos < font_span.first || pos > font_span.last)
 275                         break;
 276
 277                 bool const new_selection = pos >= row_.sel_beg && pos < row_.sel_end;
 278                 if (new_selection != selection)
 279                         // Selection ends or starts here.
 280                         break;
 281
 282                 bool const new_spell_state =
 283                         lyxrc.spellcheck_continuously && par_.isMisspelled(pos);
 284                 if (new_spell_state != spell_state)
 285                         // Spell checker state changed here.
 286                         break;
 287
 288                 Change const & change = par_.lookupChange(pos);
 289                 if (!change_running.isSimilarTo(change))
 290                         // Track change type or author has changed.
 291                         break;
 292
 293                 char_type c = par_.getChar(pos);
 294
 295                 if (c == '\t')
 296                         break;
 297
 298                 if (!isPrintableNonspace(c))
 299                         break;
 300
 301                 /* Because we do our own bidi, at this point the strings are
 302                  * already in visual order. However, Qt also applies its own
 303                  * bidi algorithm to strings that it paints to the screen.
 304                  * Therefore, if we were to paint Hebrew/Arabic words as a
 305                  * single string, the letters in the words would get reversed
 306                  * again. In order to avoid that, we don't collect Hebrew/
 307                  * Arabic characters, but rather paint them one at a time.
 308                  * See also http://thread.gmane.org/gmane.editors.lyx.devel/79740
 309                  */
 310                 if (hebrew)
 311                         break;
 312
 313                 /* FIXME: these checks are irrelevant, since 'arabic' and
 314                  * 'hebrew' alone are already going to trigger a break.
 315                  * However, this should not be removed completely, because
 316                  * if an alternative solution is found which allows grouping
 317                  * of arabic and hebrew characters, then these breaks may have
 318                  * to be re-applied.
 319
 320                 if (arabic && Encodings::isArabicComposeChar(c))
 321                         break;
 322
 323                 if (hebrew && Encodings::isHebrewComposeChar(c))
 324                         break;
 325                 */
 326
 327                 if (arabic) {
 328                         if (c == '(')
 329                                 c = ')';
 330                         else if (c == ')')
 331                                 c = '(';
 332                         c = par_.transformChar(c, pos);
 333                         /* see comment in hebrew, explaining why we break */
 334                         break;
 335                 }
 336
 337                 str.push_back(c);
 338                 prev_char = c;
 339         }
 340
 341         docstring s(&str[0], str.size());
 342
 343         if (s[0] == '\t')
 344                 s.replace(0,1,from_ascii("    "));
 345
 346         if (!selection && !change_running.changed()) {
 347                 x_ += pi_.pain.text(int(x_), yo_, s, font);
 348                 return;
 349         }
 350
 351         FontInfo copy = font;
 352         if (change_running.changed())
 353                 copy.setPaintColor(change_running.color());
 354         else if (selection)
 355                 copy.setPaintColor(Color_selectiontext);
 356
 357         x_ += pi_.pain.text(int(x_), yo_, s, copy);
 358 }
 359
 360
 361 void RowPainter::paintForeignMark(double orig_x, Language const * lang,
 362                 int desc)
 363 {
 364         if (!lyxrc.mark_foreign_language)
 365                 return;
 366         if (lang == latex_language)
 367                 return;
 368         if (lang == pi_.base.bv->buffer().params().language)
 369                 return;
 370
 371         int const y = yo_ + solid_line_offset_ + desc + int(solid_line_thickness_/2);
 372         pi_.pain.line(int(orig_x), y, int(x_), y, Color_language,
 373                 Painter::line_solid, solid_line_thickness_);
 374 }
 375
 376
 377 void RowPainter::paintMisspelledMark(double orig_x, bool changed)
 378 {
 379         // if changed the misspelled marker gets placed slightly lower than normal
 380         // to avoid drawing at the same vertical offset
 381         float const y = yo_ + solid_line_offset_ + solid_line_thickness_
 382                 + (changed ? solid_line_thickness_ + 1 : 0)
 383                 + dotted_line_offset_;
 384         pi_.pain.line(int(orig_x), int(y), int(x_), int(y), Color_error,
 385                 Painter::line_onoffdash, dotted_line_thickness_);
 386 }
 387
 388
 389 void RowPainter::paintFromPos(pos_type & vpos, bool changed)
 390 {
 391         pos_type const pos = bidi_.vis2log(vpos);
 392         Font const orig_font = text_metrics_.displayFont(pit_, pos);
 393         double const orig_x = x_;
 394
 395         // usual characters, no insets
 396         char_type const c = par_.getChar(pos);
 397
 398         // special case languages
 399         string const & lang = orig_font.language()->lang();
 400         bool const hebrew = lang == "hebrew";
 401         bool const arabic = lang == "arabic_arabtex" || lang == "arabic_arabi" ||
 402                                                 lang == "farsi";
 403
 404         // spelling correct?
 405         bool const misspelled =
 406                 lyxrc.spellcheck_continuously && par_.isMisspelled(pos);
 407
 408         // draw as many chars as we can
 409         if ((!hebrew && !arabic)
 410                 || (hebrew && !Encodings::isHebrewComposeChar(c))
 411                 || (arabic && !Encodings::isArabicComposeChar(c))) {
 412                 paintChars(vpos, orig_font.fontInfo(), hebrew, arabic);
 413         } else if (hebrew) {
 414                 paintHebrewComposeChar(vpos, orig_font.fontInfo());
 415         } else if (arabic) {
 416                 paintArabicComposeChar(vpos, orig_font.fontInfo());
 417         }
 418
 419         paintForeignMark(orig_x, orig_font.language());
 420
 421         if (lyxrc.spellcheck_continuously && misspelled) {
 422                 // check for cursor position
 423                 // don't draw misspelled marker for words at cursor position
 424                 // we don't want to disturb the process of text editing
 425                 BufferView const * bv = pi_.base.bv;
 426                 DocIterator const nw = bv->cursor().newWord();
 427                 bool new_word = false;
 428                 if (!nw.empty() && par_.id() == nw.paragraph().id()) {
 429                         pos_type cpos = nw.pos();
 430                         if (cpos > 0 && cpos == par_.size() && !par_.isWordSeparator(cpos-1))
 431                                 --cpos;
 432                         else if (cpos > 0 && par_.isWordSeparator(cpos))
 433                                 --cpos;
 434                         new_word = par_.isSameSpellRange(pos, cpos) ;
 435                 }
 436                 if (!new_word)
 437                         paintMisspelledMark(orig_x, changed);
 438         }
 439 }
 440
 441
 442 void RowPainter::paintChangeBar()
 443 {
 444         pos_type const start = row_.pos();
 445         pos_type end = row_.endpos();
 446
 447         if (par_.size() == end) {
 448                 // this is the last row of the paragraph;
 449                 // thus, we must also consider the imaginary end-of-par character
 450                 end++;
 451         }
 452
 453         if (start == end || !par_.isChanged(start, end))
 454                 return;
 455
 456         int const height = text_metrics_.isLastRow(pit_, row_)
 457                 ? row_.ascent()
 458                 : row_.height();
 459
 460         pi_.pain.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color_changebar);
 461 }
 462
 463
 464 void RowPainter::paintAppendix()
 465 {
 466         // only draw the appendix frame once (for the main text)
 467         if (!par_.params().appendix() || !text_.isMainText())
 468                 return;
 469
 470         int y = yo_ - row_.ascent();
 471
 472         if (par_.params().startOfAppendix())
 473                 y += 2 * defaultRowHeight();
 474
 475         pi_.pain.line(1, y, 1, yo_ + row_.height(), Color_appendix);
 476         pi_.pain.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color_appendix);
 477 }
 478
 479
 480 void RowPainter::paintDepthBar()
 481 {
 482         depth_type const depth = par_.getDepth();
 483
 484         if (depth <= 0)
 485                 return;
 486
 487         depth_type prev_depth = 0;
 488         if (!text_metrics_.isFirstRow(pit_, row_)) {
 489                 pit_type pit2 = pit_;
 490                 if (row_.pos() == 0)
 491                         --pit2;
 492                 prev_depth = pars_[pit2].getDepth();
 493         }
 494
 495         depth_type next_depth = 0;
 496         if (!text_metrics_.isLastRow(pit_, row_)) {
 497                 pit_type pit2 = pit_;
 498                 if (row_.endpos() >= pars_[pit2].size())
 499                         ++pit2;
 500                 next_depth = pars_[pit2].getDepth();
 501         }
 502
 503         for (depth_type i = 1; i <= depth; ++i) {
 504                 int const w = nestMargin() / 5;
 505                 int x = int(xo_) + w * i;
 506                 // only consider the changebar space if we're drawing outermost text
 507                 if (text_.isMainText())
 508                         x += changebarMargin();
 509
 510                 int const starty = yo_ - row_.ascent();
 511                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 512
 513                 pi_.pain.line(x, starty, x, starty + h, Color_depthbar);
 514
 515                 if (i > prev_depth)
 516                         pi_.pain.fillRectangle(x, starty, w, 2, Color_depthbar);
 517                 if (i > next_depth)
 518                         pi_.pain.fillRectangle(x, starty + h, w, 2, Color_depthbar);
 519         }
 520 }
 521
 522
 523 int RowPainter::paintAppendixStart(int y)
 524 {
 525         FontInfo pb_font = sane_font;
 526         pb_font.setColor(Color_appendix);
 527         pb_font.decSize();
 528
 529         int w = 0;
 530         int a = 0;
 531         int d = 0;
 532
 533         docstring const label = _("Appendix");
 534         theFontMetrics(pb_font).rectText(label, w, a, d);
 535
 536         int const text_start = int(xo_ + (width_ - w) / 2);
 537         int const text_end = text_start + w;
 538
 539         pi_.pain.rectText(text_start, y + d, label, pb_font, Color_none, Color_none);
 540
 541         pi_.pain.line(int(xo_ + 1), y, text_start, y, Color_appendix);
 542         pi_.pain.line(text_end, y, int(xo_ + width_ - 2), y, Color_appendix);
 543
 544         return 3 * defaultRowHeight();
 545 }
 546
 547
 548 void RowPainter::paintFirst()
 549 {
 550         ParagraphParameters const & pparams = par_.params();
 551         Buffer const & buffer = pi_.base.bv->buffer();
 552         BufferParams const & bparams = buffer.params();
 553         Layout const & layout = par_.layout();
 554
 555         int y_top = 0;
 556
 557         // start of appendix?
 558         if (pparams.startOfAppendix())
 559                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 560
 561         if (bparams.paragraph_separation == BufferParams::ParagraphSkipSeparation
 562                 && pit_ != 0) {
 563                 if (layout.latextype == LATEX_PARAGRAPH
 564                     && !par_.getDepth()) {
 565                         y_top += bparams.getDefSkip().inPixels(*pi_.base.bv);
 566                 } else {
 567                         Layout const & playout = pars_[pit_ - 1].layout();
 568                         if (playout.latextype == LATEX_PARAGRAPH
 569                             && !pars_[pit_ - 1].getDepth()) {
 570                                 // is it right to use defskip here, too? (AS)
 571                                 y_top += bparams.getDefSkip().inPixels(*pi_.base.bv);
 572                         }
 573                 }
 574         }
 575
 576         bool const is_rtl = text_.isRTL(par_);
 577         bool const is_seq = text_.isFirstInSequence(pit_);
 578         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << endl;
 579
 580         // should we print a label?
 581         if (layout.labeltype >= LABEL_STATIC
 582             && (layout.labeltype != LABEL_STATIC
 583                       || layout.latextype != LATEX_ENVIRONMENT
 584                       || is_seq)) {
 585
 586                 FontInfo const font = labelFont();
 587                 FontMetrics const & fm = theFontMetrics(font);
 588
 589                 docstring const str = par_.labelString();
 590                 if (!str.empty()) {
 591                         double x = x_;
 592
 593                         // this is special code for the chapter layout. This is
 594                         // printed in an extra row and has a pagebreak at
 595                         // the top.
 596                         if (layout.counter == "chapter") {
 597                                 double spacing_val = 1.0;
 598                                 if (!pparams.spacing().isDefault()) {
 599                                         spacing_val = pparams.spacing().getValue();
 600                                 } else {
 601                                         spacing_val = bparams.spacing().getValue();
 602                                 }
 603
 604                                 int const labeladdon = int(fm.maxHeight() * layout.spacing.getValue() * spacing_val);
 605
 606                                 int const maxdesc = int(fm.maxDescent() * layout.spacing.getValue() * spacing_val)
 607                                         + int(layout.parsep) * defaultRowHeight();
 608
 609                                 if (is_rtl) {
 610                                         x = width_ - leftMargin() -
 611                                                 fm.width(str);
 612                                 }
 613
 614                                 pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 615                         } else {
 616                                 if (is_rtl) {
 617                                         x = width_ - leftMargin()
 618                                                 + fm.width(layout.labelsep);
 619                                 } else {
 620                                         x = x_ - fm.width(layout.labelsep)
 621                                                 - fm.width(str);
 622                                 }
 623
 624                                 pi_.pain.text(int(x), yo_, str, font);
 625                         }
 626                 }
 627
 628         // the labels at the top of an environment.
 629         // More or less for bibliography
 630         } else if (is_seq &&
 631                 (layout.labeltype == LABEL_TOP_ENVIRONMENT ||
 632                 layout.labeltype == LABEL_BIBLIO ||
 633                 layout.labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 634                 FontInfo const font = labelFont();
 635                 docstring const str = par_.labelString();
 636                 if (!str.empty()) {
 637                         double spacing_val = 1.0;
 638                         if (!pparams.spacing().isDefault())
 639                                 spacing_val = pparams.spacing().getValue();
 640                         else
 641                                 spacing_val = bparams.spacing().getValue();
 642
 643                         FontMetrics const & fm = theFontMetrics(font);
 644
 645                         int const labeladdon = int(fm.maxHeight()
 646                                 * layout.spacing.getValue() * spacing_val);
 647
 648                         int maxdesc =
 649                                 int(fm.maxDescent() * layout.spacing.getValue() * spacing_val
 650                                 + (layout.labelbottomsep * defaultRowHeight()));
 651
 652                         double x = x_;
 653                         if (layout.labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 654                                 if (is_rtl)
 655                                         x = leftMargin();
 656                                 x += (width_ - text_metrics_.rightMargin(pm_) - leftMargin()) / 2;
 657                                 x -= fm.width(str) / 2;
 658                         } else if (is_rtl) {
 659                                 x = width_ - leftMargin() -     fm.width(str);
 660                         }
 661                         pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 662                 }
 663         }
 664 }
 665
 666
 667 /** Check if the current paragraph is the last paragraph in a
 668     proof environment */
 669 static int getEndLabel(pit_type p, Text const & text)
 670 {
 671         ParagraphList const & pars = text.paragraphs();
 672         pit_type pit = p;
 673         depth_type par_depth = pars[p].getDepth();
 674         while (pit != pit_type(pars.size())) {
 675                 Layout const & layout = pars[pit].layout();
 676                 int const endlabeltype = layout.endlabeltype;
 677
 678                 if (endlabeltype != END_LABEL_NO_LABEL) {
 679                         if (p + 1 == pit_type(pars.size()))
 680                                 return endlabeltype;
 681
 682                         depth_type const next_depth =
 683                                 pars[p + 1].getDepth();
 684                         if (par_depth > next_depth ||
 685                             (par_depth == next_depth && layout != pars[p + 1].layout()))
 686                                 return endlabeltype;
 687                         break;
 688                 }
 689                 if (par_depth == 0)
 690                         break;
 691                 pit = text.outerHook(pit);
 692                 if (pit != pit_type(pars.size()))
 693                         par_depth = pars[pit].getDepth();
 694         }
 695         return END_LABEL_NO_LABEL;
 696 }
 697
 698
 699 void RowPainter::paintLast()
 700 {
 701         bool const is_rtl = text_.isRTL(par_);
 702         int const endlabel = getEndLabel(pit_, text_);
 703
 704         // paint imaginary end-of-paragraph character
 705
 706         Change const & change = par_.lookupChange(par_.size());
 707         if (change.changed()) {
 708                 FontMetrics const & fm =
 709                         theFontMetrics(pi_.base.bv->buffer().params().getFont());
 710                 int const length = fm.maxAscent() / 2;
 711                 Color col = change.color();
 712
 713                 pi_.pain.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 714                            Painter::line_solid, 3);
 715
 716                 if (change.deleted()) {
 717                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1 + length,
 718                                 yo_ + 2, col, Painter::line_solid, 3);
 719                 } else {
 720                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1,
 721                                 yo_ + 2, col, Painter::line_solid, 3);
 722                 }
 723         }
 724
 725         // draw an endlabel
 726
 727         switch (endlabel) {
 728         case END_LABEL_BOX:
 729         case END_LABEL_FILLED_BOX: {
 730                 FontInfo const font = labelFont();
 731                 FontMetrics const & fm = theFontMetrics(font);
 732                 int const size = int(0.75 * fm.maxAscent());
 733                 int const y = yo_ - size;
 734                 int const max_row_width = width_ - size - Inset::TEXT_TO_INSET_OFFSET;
 735                 int x = is_rtl ? nestMargin() + changebarMargin()
 736                         : max_row_width - text_metrics_.rightMargin(pm_);
 737
 738                 // If needed, move the box a bit to avoid overlapping with text.
 739                 int const rem = max_row_width - row_.width();
 740                 if (rem <= 0)
 741                         x += is_rtl ? rem : - rem;
 742
 743                 if (endlabel == END_LABEL_BOX)
 744                         pi_.pain.rectangle(x, y, size, size, Color_eolmarker);
 745                 else
 746                         pi_.pain.fillRectangle(x, y, size, size, Color_eolmarker);
 747                 break;
 748         }
 749
 750         case END_LABEL_STATIC: {
 751                 FontInfo const font = labelFont();
 752                 FontMetrics const & fm = theFontMetrics(font);
 753                 docstring const & str = par_.layout().endlabelstring();
 754                 double const x = is_rtl ? x_ - fm.width(str) : x_;
 755                 pi_.pain.text(int(x), yo_, str, font);
 756                 break;
 757         }
 758
 759         case END_LABEL_NO_LABEL:
 760                 if (lyxrc.paragraph_markers && size_type(pit_ + 1) < pars_.size()) {
 761                         docstring const s = docstring(1, char_type(0x00B6));
 762                         FontInfo f = FontInfo();
 763                         FontMetrics const & fm = theFontMetrics(f);
 764                         f.setColor(Color_paragraphmarker);
 765                         pi_.pain.text(int(x_), yo_, s, f);
 766                         x_ += fm.width(s);
 767                 }
 768                 break;
 769         }
 770 }
 771
 772
 773 void RowPainter::paintOnlyInsets()
 774 {
 775         CoordCache const & cache = pi_.base.bv->coordCache();
 776         pos_type const end = row_.endpos();
 777         for (pos_type pos = row_.pos(); pos != end; ++pos) {
 778                 // If outer row has changed, nested insets are repaint completely.
 779                 Inset const * inset = par_.getInset(pos);
 780                 bool const nested_inset = inset &&
 781                                 ((inset->asInsetMath() &&
 782                                   !inset->asInsetMath()->asMacroTemplate())
 783                                  || inset->asInsetText()
 784                                  || inset->asInsetTabular());
 785                 if (!nested_inset)
 786                         continue;
 787                 if (x_ > pi_.base.bv->workWidth()
 788                     || !cache.getInsets().has(inset))
 789                         continue;
 790                 x_ = cache.getInsets().x(inset);
 791
 792                 bool const pi_selected = pi_.selected;
 793                 Cursor const & cur = pi_.base.bv->cursor();
 794                 if (cur.selection() && cur.text() == &text_
 795                           && cur.normalAnchor().text() == &text_)
 796                         pi_.selected = row_.sel_beg <= pos && row_.sel_end > pos;
 797                 paintInset(inset, pos);
 798                 pi_.selected = pi_selected;
 799         }
 800 }
 801
 802
 803 void RowPainter::paintText()
 804 {
 805         pos_type const end = row_.endpos();
 806         // Spaces at logical line breaks in bidi text must be skipped during
 807         // painting. However, they may appear visually in the middle
 808         // of a row; they must be skipped, wherever they are...
 809         // * logically "abc_[HEBREW_\nHEBREW]"
 810         // * visually "abc_[_WERBEH\nWERBEH]"
 811         pos_type skipped_sep_vpos = -1;
 812         pos_type body_pos = par_.beginOfBody();
 813         if (body_pos > 0 &&
 814                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 815                 body_pos = 0;
 816         }
 817
 818         Layout const & layout = par_.layout();
 819
 820         Change change_running;
 821         int change_last_x = 0;
 822
 823         // check for possible inline completion
 824         DocIterator const & inlineCompletionPos = pi_.base.bv->inlineCompletionPos();
 825         pos_type inlineCompletionVPos = -1;
 826         if (inlineCompletionPos.inTexted()
 827             && inlineCompletionPos.text() == &text_
 828             && inlineCompletionPos.pit() == pit_
 829             && inlineCompletionPos.pos() - 1 >= row_.pos()
 830             && inlineCompletionPos.pos() - 1 < row_.endpos()) {
 831                 // draw logically behind the previous character
 832                 inlineCompletionVPos = bidi_.log2vis(inlineCompletionPos.pos() - 1);
 833         }
 834
 835         // Use font span to speed things up, see below
 836         FontSpan font_span;
 837         Font font;
 838
 839         // If the last logical character is a separator, don't paint it, unless
 840         // it's in the last row of a paragraph; see skipped_sep_vpos declaration
 841         if (end > 0 && end < par_.size() && par_.isSeparator(end - 1))
 842                 skipped_sep_vpos = bidi_.log2vis(end - 1);
 843
 844         for (pos_type vpos = row_.pos(); vpos < end; ) {
 845                 if (x_ > pi_.base.bv->workWidth())
 846                         break;
 847
 848                 // Skip the separator at the logical end of the row
 849                 if (vpos == skipped_sep_vpos) {
 850                         ++vpos;
 851                         continue;
 852                 }
 853
 854                 pos_type const pos = bidi_.vis2log(vpos);
 855
 856                 if (pos >= par_.size()) {
 857                         ++vpos;
 858                         continue;
 859                 }
 860
 861                 // Use font span to speed things up, see above
 862                 if (vpos < font_span.first || vpos > font_span.last) {
 863                         font_span = par_.fontSpan(vpos);
 864                         font = text_metrics_.displayFont(pit_, vpos);
 865
 866                         // split font span if inline completion is inside
 867                         if (font_span.first <= inlineCompletionVPos
 868                             && font_span.last > inlineCompletionVPos)
 869                                 font_span.last = inlineCompletionVPos;
 870                 }
 871
 872                 const int width_pos = pm_.singleWidth(pos, font);
 873
 874                 if (x_ + width_pos < 0) {
 875                         x_ += width_pos;
 876                         ++vpos;
 877                         continue;
 878                 }
 879                 Change const & change = par_.lookupChange(pos);
 880                 if (change.changed() && !change_running.changed()) {
 881                         change_running = change;
 882                         change_last_x = int(x_);
 883                 }
 884
 885                 Inset const * inset = par_.getInset(pos);
 886                 bool const highly_editable_inset = inset
 887                         && inset->editable();
 888
 889                 // If we reach the end of a change or if the author changes, paint it.
 890                 // We also don't paint across things like tables
 891                 if (change_running.changed() && (highly_editable_inset
 892                         || !change.changed() || !change_running.isSimilarTo(change))) {
 893                         // Calculate 1/3 height of the buffer's default font
 894                         FontMetrics const & fm
 895                                 = theFontMetrics(pi_.base.bv->buffer().params().getFont());
 896                         float const y_bar = change_running.deleted() ?
 897                                 yo_ - fm.maxAscent() / 3 : yo_ + 2 * solid_line_offset_ + solid_line_thickness_;
 898                         pi_.pain.line(change_last_x, int(y_bar), int(x_), int(y_bar),
 899                                 change_running.color(), Painter::line_solid, solid_line_thickness_);
 900
 901                         // Change might continue with a different author or type
 902                         if (change.changed() && !highly_editable_inset) {
 903                                 change_running = change;
 904                                 change_last_x = int(x_);
 905                         } else
 906                                 change_running.setUnchanged();
 907                 }
 908
 909                 if (body_pos > 0 && pos == body_pos - 1) {
 910                         int const lwidth = theFontMetrics(labelFont())
 911                                 .width(layout.labelsep);
 912
 913                         x_ += row_.label_hfill + lwidth - width_pos;
 914                 }
 915
 916                 // Is the inline completion in front of character?
 917                 if (font.isRightToLeft() && vpos == inlineCompletionVPos)
 918                         paintInlineCompletion(font);
 919
 920                 if (par_.isSeparator(pos)) {
 921                         Font const orig_font = text_metrics_.displayFont(pit_, pos);
 922                         double const orig_x = x_;
 923                         x_ += width_pos;
 924                         if (pos >= body_pos)
 925                                 x_ += row_.separator;
 926                         paintForeignMark(orig_x, orig_font.language());
 927                         ++vpos;
 928
 929                 } else if (inset) {
 930                         // If outer row has changed, nested insets are repaint completely.
 931                         pi_.base.bv->coordCache().insets().add(inset, int(x_), yo_);
 932
 933                         bool const pi_selected = pi_.selected;
 934                         Cursor const & cur = pi_.base.bv->cursor();
 935                         if (cur.selection() && cur.text() == &text_
 936                                   && cur.normalAnchor().text() == &text_)
 937                                 pi_.selected = row_.sel_beg <= pos && row_.sel_end > pos;
 938                         paintInset(inset, pos);
 939                         pi_.selected = pi_selected;
 940                         ++vpos;
 941
 942                 } else {
 943                         // paint as many characters as possible.
 944                         paintFromPos(vpos, change_running.changed());
 945                 }
 946
 947                 // Is the inline completion after character?
 948                 if (!font.isRightToLeft() && vpos - 1 == inlineCompletionVPos)
 949                         paintInlineCompletion(font);
 950         }
 951
 952         // if we reach the end of a struck out range, paint it
 953         if (change_running.changed()) {
 954                 FontMetrics const & fm
 955                         = theFontMetrics(pi_.base.bv->buffer().params().getFont());
 956                 float const y_bar = change_running.deleted() ?
 957                                 yo_ - fm.maxAscent() / 3 : yo_ + 2 * solid_line_offset_ + solid_line_thickness_;
 958                 pi_.pain.line(change_last_x, int(y_bar), int(x_), int(y_bar),
 959                         change_running.color(), Painter::line_solid, solid_line_thickness_);
 960                 change_running.setUnchanged();
 961         }
 962 }
 963
 964
 965 void RowPainter::paintSelection()
 966 {
 967         if (!row_.selection())
 968                 return;
 969         Cursor const & curs = pi_.base.bv->cursor();
 970         DocIterator beg = curs.selectionBegin();
 971         beg.pit() = pit_;
 972         beg.pos() = row_.sel_beg;
 973
 974         DocIterator end = curs.selectionEnd();
 975         end.pit() = pit_;
 976         end.pos() = row_.sel_end;
 977
 978         bool const begin_boundary = beg.pos() >= row_.endpos();
 979         bool const end_boundary = row_.sel_end == row_.endpos();
 980
 981         DocIterator cur = beg;
 982         cur.boundary(begin_boundary);
 983         int x1 = text_metrics_.cursorX(beg.top(), begin_boundary);
 984         int x2 = text_metrics_.cursorX(end.top(), end_boundary);
 985         int const y1 = yo_ - row_.ascent();
 986         int const y2 = y1 + row_.height();
 987
 988         int const rm = text_.isMainText() ? pi_.base.bv->rightMargin() : 0;
 989         int const lm = text_.isMainText() ? pi_.base.bv->leftMargin() : 0;
 990
 991         // draw the margins
 992         if (row_.begin_margin_sel) {
 993                 if (text_.isRTL(beg.paragraph())) {
 994                         pi_.pain.fillRectangle(int(xo_ + x1), y1,
 995                                 text_metrics_.width() - rm - x1, y2 - y1, Color_selection);
 996                 } else {
 997                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x1 - lm, y2 - y1,
 998                                 Color_selection);
 999                 }
1000         }
1001
1002         if (row_.end_margin_sel) {
1003                 if (text_.isRTL(beg.paragraph())) {
1004                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x2 - lm, y2 - y1,
1005                                 Color_selection);
1006                 } else {
1007                         pi_.pain.fillRectangle(int(xo_ + x2), y1, text_metrics_.width() - rm - x2,
1008                                 y2 - y1, Color_selection);
1009                 }
1010         }
1011
1012         // if we are on a boundary from the beginning, it's probably
1013         // a RTL boundary and we jump to the other side directly as this
1014         // segement is 0-size and confuses the logic below
1015         if (cur.boundary())
1016                 cur.boundary(false);
1017
1018         // go through row and draw from RTL boundary to RTL boundary
1019         while (cur < end) {
1020                 bool draw_now = false;
1021
1022                 // simplified cursorForward code below which does not
1023                 // descend into insets and which does not go into the
1024                 // next line. Compare the logic with the original cursorForward
1025
1026                 // if left of boundary -> just jump to right side, but
1027                 // for RTL boundaries don't, because: abc|DDEEFFghi -> abcDDEEF|Fghi
1028                 if (cur.boundary()) {
1029                         cur.boundary(false);
1030                 }       else if (text_metrics_.isRTLBoundary(cur.pit(), cur.pos() + 1)) {
1031                         // in front of RTL boundary -> Stay on this side of the boundary
1032                         // because:  ab|cDDEEFFghi -> abc|DDEEFFghi
1033                         ++cur.pos();
1034                         cur.boundary(true);
1035                         draw_now = true;
1036                 } else {
1037                         // move right
1038                         ++cur.pos();
1039
1040                         // line end?
1041                         if (cur.pos() == row_.endpos())
1042                                 cur.boundary(true);
1043                 }
1044
1045                 if (x1 == -1) {
1046                         // the previous segment was just drawn, now the next starts
1047                         x1 = text_metrics_.cursorX(cur.top(), cur.boundary());
1048                 }
1049
1050                 if (!(cur < end) || draw_now) {
1051                         x2 = text_metrics_.cursorX(cur.top(), cur.boundary());
1052                         pi_.pain.fillRectangle(int(xo_ + min(x1, x2)), y1, abs(x2 - x1),
1053                                 y2 - y1, Color_selection);
1054
1055                         // reset x1, so it is set again next round (which will be on the
1056                         // right side of a boundary or at the selection end)
1057                         x1 = -1;
1058                 }
1059         }
1060 }
1061
1062
1063 void RowPainter::paintInlineCompletion(Font const & font)
1064 {
1065         docstring completion = pi_.base.bv->inlineCompletion();
1066         FontInfo f = font.fontInfo();
1067         bool rtl = font.isRightToLeft();
1068
1069         // draw the unique and the non-unique completion part
1070         // Note: this is not time-critical as it is
1071         // only done once per screen.
1072         size_t uniqueTo = pi_.base.bv->inlineCompletionUniqueChars();
1073         docstring s1 = completion.substr(0, uniqueTo);
1074         docstring s2 = completion.substr(uniqueTo);
1075         ColorCode c1 = Color_inlinecompletion;
1076         ColorCode c2 = Color_nonunique_inlinecompletion;
1077
1078         // right to left?
1079         if (rtl) {
1080                 swap(s1, s2);
1081                 swap(c1, c2);
1082         }
1083
1084         if (s1.size() > 0) {
1085                 f.setColor(c1);
1086                 pi_.pain.text(int(x_), yo_, s1, f);
1087                 x_ += theFontMetrics(font).width(s1);
1088         }
1089
1090         if (s2.size() > 0) {
1091                 f.setColor(c2);
1092                 pi_.pain.text(int(x_), yo_, s2, f);
1093                 x_ += theFontMetrics(font).width(s2);
1094         }
1095 }
1096
1097 } // namespace lyx